Hey girl. We know each other from HP. I love Weiss. Watch the Knight Hunters DVDs if you really want to know the fandom, but it honest to goodness isn't necessary to read fanfic. The great thing about this fandom is that anything goes. Really, anything goes. And people just enjoy playing with the toys more than the anime itself.
I feel like I know a little of your tastes from the common hp communities we are in, so I feel comfortable recommending a story to you. Read Sinners and Saints by Miko no Da. It is the best fanfic I have ever read in any fandom ever. You know with all the great hp fanfic out there, that is saying something. This fanfic is over 400 pages, but perfect and amazing on so many levels. It's strong D/s BDSM but also very strong hurt/comfort. It has a full plot of its own and it all comes together in the ending. You don't need to know much of anything about the anime to read it. The first chapter is mostly set-up, but chapter 2 is amazing. I've read this story a million times and it is still just as amazing as the first time. Think I've gone on about it enough? I really do think you will like it. If you decide to read it, let me know what you think. I'd really love to discuss this story with someone.
I think you will be okay with it, but for anyone else that is reading this, this is a very NC-17 story. There are descriptions of rape, chan rape, abuse, etc. It's very graphic and not a kids story! The descriptions of the bad things that happened are all described in a negative way, a horrible thing that happened to a character, but it is ADULT.